I had the same reaction, though for me I have a bunch more tshirts, most of which I didn’t pay for. I just keep two piles of shirts on my shelf. In the morning I take the top shirt off the “active” pile. Clean shirts from the laundry go on top of the other pile. When they wear out they go into the garage as rags.

Side note, I think cost per wear should factor in laundry costs. I suppose you could consider that just part of overhead if everything is just wash & wear, but it would come into play if you had anything that needed special treatment (suits to dry cleaners or something).